Table 4 Calculated heat units required for life cycle of females of Tuta absoluta in Qena governorate during 2012
Month | No. of days (n) | Average temp. °C (t) | D. zero (x) | Thermal constant (y) | Heat units (degree days) | Duration/days (N) | Rate of generation development (G) | |
|---|---|---|---|---|---|---|---|---|
t − x | n (t − x) | |||||||
February 2012 | 29 | 17.56 | 5.268 | 799.10 | 12.29 | 356.41 | 65.02 | 0.45 |
March | 31 | 19.74 | 14.47 | 448.57 | 55.22 | 0.56 | ||
April | 30 | 27.24 | 21.97 | 659.1 | 36.37 | 0.82 | ||
May | 31 | 31.13 | 25.86 | 805.02 | 30.90 | 1.01 | ||
June | 30 | 33.87 | 28.60 | 858.00 | 27.90 | 1.07 | ||
July | 31 | 34.36 | 29.09 | 901.79 | 27.47 | 1.13 | ||
August | 31 | 33.10 | 27.83 | 862.73 | 28.71 | 1.08 | ||
September | 30 | 31.07 | 25.80 | 774.00 | 30.97 | 0.97 | ||
October | 31 | 28.54 | 23.27 | 721.37 | 34.34 | 0.91 | ||
November | 30 | 22.80 | 17.53 | 525.9 | 45.58 | 0.66 | ||
December | 31 | 16.81 | 11.54 | 357.74 | 69.25 | 0.45 | ||
January 2013 | 31 | 16.20 | 10.93 | 338.83 | 73.1 | 0.42 | ||
Total | 312.42 | 524.83 | 9.53 | |||||
Average | 26.04 | 43.74 | 0.79 | |||||